Annunciators

Annunciators are symbols that appear in the display as messages, or after certain keys or key combinations have been pressed. Annunciators are special symbols indicating a specific status in the calculator. Figure 3 illustrates the annunciator symbols in the display.

Secondary

Valid item for the

Valid item for

function active

Input key

the Equals key

Assigned value

Low batteries

Number recall

active

RPN mode

active

Begin mode

Radians active

360 day-count calendar active

Number storage

active

active

 

 

Figure 3 Annunciator Symbols in the Screen Display

The Input Key

The Ikey is used to input values for variables and execute menu items.

The Ikey is also used in Reverse Polish Notation (RPN) mode to enter a number on the stack or duplicate it.

The Equals Key

The =key is used at the end of a mathematical operation to calculate the final result. For example, 1+2=returns a final result of 3.

The =key, when pressed outside of a mathematical operation, also allows you to request a calculation for the value of an item. This request only applies to items that can be calculated.

Using the Input and Equals Keys

Suppose you wanted to calculate the effective interest rate for a 12% nominal interest rate with 12 payments per year in the Interest Conversion (IConv) menu. To open the IConv menu, press

:&. Nom %= displays on the top line, and the current value assigned to the nominal

6 Basic Features

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HP 20b Consultant Financial, 30b Professional manual Annunciators, Input Key, Using the Input and Equals Keys

30b Professional, 20b Consultant Financial specifications

The HP 30b Professional calculator is a versatile tool designed specifically for business professionals, engineers, and educators. This reliable calculator merges advanced technologies with user-friendly features, enabling users to perform complex calculations with ease. The HP 30b is appreciated for its robust design and functionality, making it a top choice among those who require a dependable calculating device for various applications.

One of the standout features of the HP 30b is its capability to handle both RPN (Reverse Polish Notation) and algebraic entry modes. This flexibility allows users to choose the input method that best suits their preferences, enhancing productivity and minimizing calculation errors. The calculator also boasts a large, high-resolution display that ensures clarity when navigating through calculations and results.

The HP 30b comes equipped with essential business functions that include financial calculations, cash flow analysis, and statistical functions, all of which are invaluable in professional settings. Users can seamlessly compute interest rates, perform amortization schedules, and evaluate loan payments, making it an indispensable asset for finance-oriented individuals.

Another key characteristic is its programmable functionality. The HP 30b allows users to create custom programs tailored to specific tasks, which can save time and reduce manual entry errors. This programmable capability is especially beneficial for repetitive calculations, providing a significant efficiency boost in ambiguous or multi-step operations.

The durable construction of the HP 30b ensures longevity while the compact design makes it portable and convenient for on-the-go calculations. Additionally, the calculator features an energy-efficient design, which includes a long-lasting battery life, reducing the need for frequent replacements.

With a straightforward key layout and intuitive interface, the HP 30b is designed with user experience in mind. Whether in a classroom, office, or fieldwork scenario, users can easily navigate functions and access the features they need quickly. The HP 30b Professional calculator is truly an impressive blend of technology and practicality, making it an essential tool for anyone needing reliable performance in their daily calculations.